history. >> there's more counterfeiting going on in china now than we've ever seen anywhere. >> dan chow should know. a law professor at ohio state university, his specialty is chinese counterfeiting. we know that 15% to 20% of all goods in china are counterfeit. >> and these days, the way china's economy is booming, 15% to 20% means tens of billions of dollars. evidence of the counterfeiting trade can be seen at this hong kong warehouse where counterfeit watches, shoes, computer chips, all copied in china, and seized in hong kong, are tossed onto a conveyor belt, and consigned to the dust bin of history. but it's like stopping the rain, the seizure may look impressive, but every day, 6,000 shipping containers leave hong kong's harbor for the u.s. packed with products made in china, and only a small fraction of those containers are ever inspected. >> this is the most profitable criminal venture, as far as i know, on earth. >> counterfeiting. >> counterfeiting. and your partners don't kill you. >> attorney harley lewin has been chasing counterfeiters from china for more than twenty years.